Centrifugal machine.



PATENTED FEB. 27, 1906.

A. PREITAG. V GBNTRIFUGAL MACHINE.

'APPLIOATIONIILED JAN. 8. 1902.

2 SHEETS-SHEET l.

I ZQ l f 02/ *ww I 7" T /"I I H unrrnn STATES PATENT OFFICE ANDREASFREITAG, OF AMSTERDAM, NETHERLANDS, ASSIGNOR TO WATSON, LAIDLAW &COMPANY, OF GLASGOW, SCOTLAND.

CENTRIFUGAL MACHINE.

Specification of Letters Patent.

Patented Feb. 27, 1906.

To all whom it may concern.-

Be it known that I, ANDREAS FREITAG, factory manager, residing at 57Spaarndamerstraat, Amsterdam, Netherlands, have invented a new anduseful Improvement in Centrifugal Machines, of which the following is aspecification.

This invention relates to the improvement of centrifugal machines orhydro-extractors whereby a fluid under suitable pressure is substitutedfor the ordinary footstep-bear- %t is well known that the lubrication ofthe footste bearings of a certain class of centrifuga machines isaugmented byforcing oil or other lubricating fluid under the revolvingspindle, so as to remove or lessen the weight of the footstep orbearing. A possible defect of this arrangement is that in the event ofthe supply of oil failing the Whole Weight of the revolving parts wouldcome in direct contact with the footstep-bearing, which would result inthe abrasion of that part fromwant of lubrication. I construct themachine in such a manner that a supply of oil or other lubricating fluidis maintained in the footstep-bush at such a pressure as will supportthe whole of the revolving spindle, and thereby form a liquidfootstep-bearing.

The combination of fluid-pressure footstepbearing as described isapplicable to all kinds of centrifugal machines irres ective of themethod of driving, the word footstep being applicable to the spindle ofboth suspended and underdriven centrifugals whether they have rigidbearings, elastic or semi-elastic hearings, or self-balancing bearings.

In machines driven by fluid-pressure I may use the fluid which serves todrive the machine to support the spindle.

In order to make my invention more clear, reference will be had to theaccompanying drawings, in which Figure 1 is an elevation, part insection, of my invention applied to a form of the suspended centrifugalsof the Weston type; and Fig. 2 is a similar view of the invention asapplied to another form of the same type of machines.

In these machines there is an outer revolving spindle A and a stationaryspindle B within it, which carries the weight of the revolving spindleA, basket, and load. I make In order to remedy this defect,

the inner spindle B hollow and force the lubricating fluid underpressure into the hollow s indle by the pipe 0 through the passage D tothe port E, and so into the chamber F. A cup M is secured to the innerwall of the outer spindle A at the base of the spindle B. Attached tothe inner wall of the revolving spindle A there is a ring or bush G, anda similar ring or bush H is attached to the stationary spindle B. Thepressure of the fluid in the chamber F acting on the ring or bush Graises the spindle A, with basket. and load. The brake-surface J isattached to the spindle A and will be raised off the brake-surface Kwhen the spindle rises, and the movable parts will be free to revolve.The brake-surface J is formed convex and the brake-surface Kcorrespondingly concave, so as to allow for oscillation of the basket.In order to prevent the centrifugal from rising too high, I provide theort N, which is uncovered by the ring G W en the spindle has risen tothe desired height. The lubricating fluid escapes through the port N andthe ducts O O,formed on the lower and u per ends of the spindle, intothe chamber aliove the brake-surface J and through holes P onto thebrake-surface K. It then escapes through the pipe L and returns to thepump.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is the following:

1. In a centrifugal machine, the combination of an outer revolvingspindle, an inner axially-movable spindle, a bush on the inner wall ofsaid outer spindle, a bush on the outer wall of said inner spindle, saidinner spindle having a port discharging into the chamber formed betweenthe two said bushes.

2. In a centrifugal machine, the combination of an outer revolving sindle, an inner axially-movable spindle, a ush rigidly secured to theinner wall of the revolving outer spindle, a bush rigidly secured to theouter wall of the inner stationary spindle, said inner spindle having aport for leading a fluid under pressure to the chamber formed betweenthe two said bushes.

3. In a centrifugal machine, the combination of an outer revolvingspindle, an inner axially-movable spindle, a rin on the inner wall ofthe outer spindle, a bus on the outer wall of the inner spindle, saidring and bush forming together with their respective spindle-walls achamber for receiving a fluid unspindles a chamber for the reception of.a fluid der pressure, said inner spindle having a duct under pressure.10 for leadin the fluid under pressure to the In testimony whereof Iafiix my signature said cham er. in the. presence of two witnesses.

5 4. In a centrifugal machine, the combina- ANDREAS FREITAG.

tion of two concentric hollow spindles, and Witnesses: bushes on theadjacent walls of said spindles F. DIERHAUS,

forming with the walls of their respective L. GOBET.

